Model-Driven Architecture

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1 THE IT-ARCHITECTURE PROFESSIONALS Model-Driven Architecture Stephen J. Mellor, Kendall Scott, Axel Uhl, Dirk Weise Interactive Objects Software

2 Agenda 2 Motivation for MDA Terminology: Models, Metamodels, Representations, Mappings, Platforms, PIM/PSM, Annotations (and Related Standards / Technologies) Model Transformations and Annotations: Facts and Visions (and Related Standards / Technologies) Specifying / Implementing Standardization Efforts MDA Process Shaping and executing an MDA Instance

3 References 3 ormsc/ (previous ormsc guide) ormsc/ (latest ormsc guide) ormsc/ (Interactive Objects Position Paper) MOF 2.0 Queries / Views / Transformations RFP Other papers from

4 MDA and the Architectural IDE: High ROI 4 Complete Systems Change Platforms 2 & 1 Rework effort w/ high-end Architectural IDE Deployable Infrastructure on Target Platform, Completely Specified. Content Level (extent of convergent metamorphosis) $ ROI with each and every change! Manual Rework Lines Rework effort w/o high-end Architectural IDE Effective representation (modeling styles) and automation begins in higher P-stacks: MDA automation lines Effective representation and automation begins at lower P-stacks. Whiteboard Sketches a.k.a. The MDA Phase Diagram. From io s OMG MDA submission Dec P-stack 4 P-stack 3 P-stack 2 P-stack 1 PIM -> PSM P-stacks 2002, Interactive Objects GmbH

5 The Challenge of Enterprise Java (.NET, z/os ) 5 Number of pages in specification Widening scope JAAS Connector JAXP JavaMail JTA JMS JSP Servlets JDBC EJB 0 J2EE 1.0 J2EE 1.1 J2EE 1.2 J2EE 1.3

6 Takes the path of lowest effort & risk each time 6 Detailing at low abstraction level causes extra effort and errors. Example: Associations between EJB components Content Level Metamodels / P-Stacks

7 Models, Metamodels, and the Platform Stack 7 Model instance_of 1 Metamodel +describes 1..n 0..1 Platform 1..n Standards: -UML - standardized UML profiles -XMI - Progr. Languages Standard: -MOF Standards: -CORBA -J2EE -.NET -Linux - Windows +realizedon PrimitiveRealization 1..n PlatformRealization implemented_with ComposedRealization

8 The Heart of MDA: Mapping Models 8 Model instance_of 1 Metamodel +describes Platform +source 1..n 1 +target 1..n +source 1..n target Mapping application_of MappingTechnique terminology: mapping = ^ transformation 1 Specification / (implementation?) getting standardized by MOF 2.0 Query / View / Transformation RFP. Implementation also called "Cartridge". Multiple mappings may be applied successively in a chain

9 Representing Models: Some Examples 9 editable ASCII UML Graphical Notation ASCII UML Graphical Notation representation UML textual notation syntax UML textual notation syntax UML UML ASCII UML Profile for "EJB Compact Bean" UML Profile for JSR 26 Java Syntax programmatically accessible EJB Compact Bean EJB Expanded Bean (JSR 26) Java Abstract Syntax Tree metamodels

10 10 Formal: Mapping Techniques for Representations conforms_to 0..1 Model Metamodel +abstractsyntax +represent ingmodel 0..n 1..n +source renders Example: UML Profile 0..n +targetmappingtechnique MappingTechnique 0..n +sourcemappingtechnique +representedmodel 0..1 Model conforms_to Metamodel +target +abstractsyntax

11 Keeping The Model Platform-Independent 11 Unannotated PIM terminology: annotation = ^ marking Unannotated PIM annotations for platform A annotations for platform B Unannotated PIM Unannotated PIM annotations for platform A annotations for platform B annotations for platform A annotations for platform B Unannotated PSM Platform A Unannotated PSM Platform B

12 Annotations for Specific Mapping Techniques 12 +model Model conforms_to +abstractsyntax 0..1 Metamodel +metamodel +target 1 1..n +source +target 1 1..n +so urce +sourcemapping 0..n 0..n +targetmapping Mapping +sourcemappingtechnique application_of 1 0..n 0..n MappingTechnique +targetmappingtechnique +requiringmapping 0..n 0..n +providingmapping +mappingtechnique +requi ringmappingtechnique 0..n 0..n +providingmappingtechnique Example: Record of the transformation +requiredannotation 0..n 0..n Annotation +providedannotation +requiredannotationmodel instance_of 1 0..n 0..n AnnotationModel +providedannotationmodel +annotationmodel 0.. n 0..* +annotation +annotationmodel

13 Abstraction or Refinement? 13 Mapping techniques sometimes intuitively seem to implement an abstraction, leading to more abstract metamodels, or a refinement, leading to more detailed metamodels, between two metamodels. Consequently, the one metamodel is sometimes called an abstraction or a refinement of the other What does this mean formally? When do we call a mapping technique a "refining" one? When do we call it an "abstracting" one?

14 Formal Definition: Refinement 14 Let A and B be two metamodels B is said to be a refinement of A if a "reasonable" (semantic-preserving) surjective mapping technique (or mapping in the algebraic sense) from A to B cannot be provided.

15 Refining Mappings Visualized 15

16 Formal Definition: Abstraction 16 Let A and B be two metamodels B is said to be an abstraction of A if a "reasonable" (semantic-preserving) surjective and non-injective mapping technique (or mapping in the algebraic sense) from A to B can be provided. Non-injectiveness implies that a mapping technique exists that maps at least two instances of A to the same instance of B.

17 Abstraction and Refinement: Conclusions 17 There may be mapping techniques which are formally neither an abstraction nor a refinement. Example: Java C++ transformation Formalizing the terms is possible but doesn't really help. An intuitive use aligned along the particular MDA instance and its goals seems most appropriate.

18 PIM and PSM: The Endless Debate 18 PIM: Platform Independent Model What is a platform? Is a (vertical) domain a platform? Do platforms have to be executable? What platform(s) is a PIM independent of? How can you call a PIM "platform independent" if it eventually needs one to run on? PSM: Platform Specific Model What platform(s) is a PSM specific to? Can a PSM be PIM with regard to other platforms?

19 PIM and PSM: Resolving the Dispute A model can be PIM and PSM at the same time. PIM and PSM are roles a model can assume with regard to a specific (set of) platform(s). Platforms can be seen as specific domains Example: A Java program is a PIM with regard to the operating system platforms that Java runs on. A Java program is a PSM with regard to the programming language and API platform (the JDK) 19 Java Program PIM PSM JDK / JVM Solaris Linux Windows

20 Model Transformations: Facts and Visions MOF as basis for metamodels becomes common. Exception: ASCII-based target "metamodels". Specification of transformations varies ASCII-based target metamodels templates mixed with scripting (akin to JSP approach) UML-based (ArcStyler / CARAT) XML / XSLT hard-wired mostly irreversible (often not possibly without ambiguities) MOF-based target metamodels rules-based hard-wired sometimes reversible (when unambiguously possible) 20

21 Transform. Spec.: Requirements and Criteria 21 (partly taken from MOF 2.0 Queries, Views, and Transformations RFP, and from ormsc/ ): reusability extensibility scalability (for large metamodels) handling complexity efficiency (for large models) incremental applicability (transforming changes only) reversibility (where possible)

22 MDA Process 22 [ Instantiating the MDA ] Identify the set of target platforms Identify the metamodels you want to use Define the mapping techniques between the metamodels Define the annotation models required by the previously defined mapping techniques Implement the mapping techniques

23 MDA Process (cont'd) [ Executing the MDA Instance ] 6 Conduct the iterations of the project Add/edit detail in one or more of the mapping's source models Add/edit contents of the mapping-specific annotations to one or more of the mapping's source models Verify the model for mappability Perform the mapping, which results in a new or changed target model These three steps can be repeated iteratively / incrementally 23

24 Example: Cartridge Development at io 24 three years of profound, hands-on experience projects and product (ArcStyler) from CRC cards via UML to J2EE technologies, CORBA, host-based environments (COBOL, XML adapters,...) went through three generations of cartridge architectures productized cartridge extensibility since ArcStyler 1.0 customers using it in real-world projects But: Still some issues to be solved

25 Cartridge Architecture History at io 25 ArcStyler 1.x w/ CARAT 0.0 template files weaving in JPython script parts with plain text large "flat" JPython function libraries with little structure master.tpl and iterator.py controlled generation process Pros: templates correspond closely with output Cons: little reuse within single cartridge even less reuse across cartridges hard to extend "design" not scalable for more complex cartridges

26 Cartridge Architecture History at io 26 ArcStyler 2.x w/ CARAT 1.0 using OO to structure cartridges into classes and objects inheritance possible between whole cartridges complete re-write of cartridges, beginning with IAS/BAS Pros: significantly increased reuse within and across cartridges improved design, geared towards extensibility Cons: generated output harder to recognize in templates tricky wiring of cartridge elements (who triggers what,...) hard to get a grip on how the pieces work together

27 Cartridge Architecture History at io 27 ArcStyler 3.x w/ CARAT 2.0 cartridges modeled using CARAT-specific meta-model with corresponding UML profile generate cartridge impl. using CARAT cartridge, fill in PAs Pros: practice what you preach: reaps MDA benefits for cartridge devel. comparatively easy visual configuration of cartridges scales up to very complex cartridges eased extensibility improved integration into ArcStyler due to consistent cartridges: selective artifact generation, progress indication cartridge profiling and improved precompilation

28 Generating Cartridges with a Cartridge 28

29 Cartridge Configuration 29 Specify base cartridge(s) Set root generatable (<<CARATRoot>>) Associate utility class

30 Model - Artifact Relationship 30 What we have UML business model representing some functionality What we want (for model to code transformations) Physical artifacts executing this functionality within an IT infrastructure, e.g. Java classes in a JVM

31 Grouping Artifacts into Sets 31

32 Defining Extension Points: Artifact Sections Modeled artifacts can define fine-grained artifact sections 32

33 Representing the Source Metamodel Blueprints correspond with metamodel elements (Class, Attribute, Operation, AssociationEnd,...) Blueprint inheritance mimics metamodel inheritance Reuse of whole inheritance subtrees by registries 33

34 Model - Artifact Relationship 34 This is "where the rubber hits the road" Blueprints know the representation of "their" metamodel elements in the contexts they are registered with Use "protected areas" in places where refinements may be applied to results

35 Example: Adding an Artifact to Java2 Cartridge 35

36 Example (cont'd) 36

37 Cartridges Developed with this Approach at io 37 >30MB UML cartridge models ~1700 classes with multiple rules each ~6700 rule connections (as UML associations) ~22MB Jython sources generated, 1.5MB of them manually refined (<7%)

38 Caveats: MOF Q/V/T Still at the Very Beginning 38 MDA tools are now ready for prime-time. We should apply them in order to not to abstract from 0 to n, standardizing prematurely make sure a standard is built on solid, profound experience from real-world projects allow for diversity of approaches before validation and consolidation takes place

39 Open Issues Regarding Transformations 39 How can manual refinements in non-ascii target models be supported? "Protected Areas" defined on MOF-specified metamodels techniques to detect manual refinements in such areas How to reverse-enable transformation fan-out? How to combine reversibility with extensibility? How do different approaches handle large-scale transformations? How to derive an implementation from the specification (we can do ~93% for model-to-code today)?

40 Outlook 40 Development and standardization of domain- / platformspecific metamodels, using MOF Development and standardization of mapping techniques (transformations) between them, using MOF 2.0 Q/V/T

41 THE IT-ARCHITECTURE PROFESSIONALS MDA Discussion Overview June 26, 2002 OMG_Orlando.ppt Interactive Objects Software GmbH Basler Strasse Freiburg, Germany Tel. [+49] 761 / Fax [+49] 761 / info@io-software.com

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